Bkick-machiwe



entran s'rAT ISAAC GREGG, OF PITTSBURGH, PENNSYLVANIA.

BRICK-MACHINE.

Specication of Letters Patent No. 8,284, dated August 5, 1851.

To @ZZ fio/0m t may concern Be it known t-hat I, ISAAC Grimes, of

Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented sundry new and useful Improvements in Machines for Making Bricks of Untempered Clay; and I do hereby declare that the following is a full and exact description'thereof, reference being had to the accompanying drawing, making a part of this specification.

In its general construction and operation, the brick machine containing the within described improvements, is similar to that pateuted by me J une 16th, 1848; the clay being` thrown into a hopper A, containing a heavy pressure roller B, by which the clay is forced through an opening in the bottom of ,the hopper into a series of molds that are made to pass back and forth under the same by means of a pitman or other equivalent contrivance.

In the machine patented by me J une 16th, 18418, before referred to, the molds were made of extra depth, and the clay forced into them to form the bricks, was by a preliminary process, elevated therein a distance equal to the eXtra depth of the molds; and the surplus clay thus elevated above the tops of the molds was cut off by a knife which left the upper surfaces of the molded bricks hard and smooth, and their angles perfect; when the said molded bricks were removed from the molds in the usual manner.

In this my improved machine, I also make the molds of eXtra depth, and after forcing the clay into them by the large roller B, I partially elevate the compressed clay therein for -the purpose of subjecting the same to further action by which a more perfect form is given to the molded bricks. Before I subject the surplus clay elevated above the tops of the molds to the action of the knife n, I act upon it a second time by pressure, by means of a small roller or stationary bar j), placed a short distance in frontl of the said knife, which is more minute in its operation than the large roller B, and serves to force the clay more perfectly into the angles of the molds; and the interposition of this second pressure roller, or bar, between the main pressure roller and the knife n, con stitutes my first improvement in theaforesaid machine for making' bricks of untemn pered clay.

My second improvement consists in placing a transverse plate m, in the rear of the knife n-the under surface fof which is made perfectly even and smooth',-and in connection therewith, slightly elevating bottoms e, e, of the molds when passing under the said plate, for the purpose of subjecting the clay in the molds to additional compression against the same,

they are and in consequence ofv this action causing so great an amount of fricion to be exerted upon the upper surface of the clay in each of the molds, as to move the body thereof toward the rear and press it against the rear side of the mold with sufficient force to give to the after edge and angles of each molded brick, as smooth and perfect a form as can the false o be shaped by and other process; and making a solider and more uniformly compacted brick than has ever been formed by any f other process.

The false bottoms e, e, of the molds may be elevated by any mechanical contrivance that may be deemed expedient.

The accompanying drawing is a longitudinal vertical section of a brick machine having these my latest improvements.

f, f, are legs descending from the movable bottoms e, e, of the molds; and g, g, are friction rollers combined with the lower ends of the said legs.

y', is roller for giving the first partial elevation to the bottoms of the molds, and k, is a plane surface extending forward from the roller for the legs of the bottoms of the molds to rest and traverse upon while he pressure roller, or bar p, is acting upon the clay in the molds, and the knife n, is removing the surplus portions thereof.

Z, is a roller at the front end of the plane 7c, for giving the second partial elevations the bottoms of the molds while they are passing beneath the plate m. After this last operation, the mold bricks are raised out of the molds by means of an inclined plane for the legs descending from the bottoms of the molds to pass over, or by any other suitable contrivance.

The roller h, upon the arbor z', bears against the under side of the carriage containing the molds, immediately under the large pressure roller B.

That I claim as my invention and desire to secure by Letters Patent, is

l. The placing the auxiliary pressure roller h01" its equivalent-between the main roller B, and the knife n, for the purpose of subjecting the surplus clay, after it is elevated above the tops of the molds, to the ae tion of pressure before removing the same by the said knife, substantially as herein set 5 forth.

2. I also Claim the subjecting the upper surface of the AClay in each mold to a rubbing pressure, by means of a plate WIr-or its equivalent#plaeed above the tops of the 10 molds, in combination with some mechanical device for forcing up the movable bottoms of the said molds While passing under the said plate, substantially in the manner and for the purpose herein set forth.

The above specification of my improve- 15 ments in brick-machines signed this 14th day of July, 1851.

ISAAC GREGG. lVitnesses:

N. Pn'r'rns'roivn, O. ORMSBY GREGG, FRANCIS I. KERK. 

